Naomi Watts and Liev Schreiber took their sons Sasha and Samuel along for a stroll in the Big Apple yesterday. The family of four often explores the city together. During their latest outing, Sasha was seen wearing a Piggyback Rider — a new, backpack-style apparatus for moms and dads — strapped to his feet as he hitched a ride on Liev's back. The family is back in NYC after a few mid-Summer getaways to the Hamptons, where they played by the water and unwound on the beach. They marked the last few days of the season at home with stops for ice cream and visits to the local park. Naomi and Liev have been taking a break from filming lately, but she stepped out just a few days ago to support a charitable cause, joining the likes of Stella McCartney and Sarah Jessica Parker at the New York City Ballet's Fall gala. Naomi's return to theaters is drawing near, with J. Edgar debuting this November.